WO2013044719A1

WO2013044719A1 - Method and device for terminal to access network

Info

Publication number: WO2013044719A1
Application number: PCT/CN2012/080913
Authority: WO
Inventors: 夏金环
Original assignee: 华为技术有限公司
Priority date: 2011-09-27
Filing date: 2012-09-03
Publication date: 2013-04-04
Also published as: CN103024834A; CN103024834B

Abstract

A method for a terminal to access a network comprises: a terminal accessing a network and working at a downlink central working frequency; receiving dedicated physical broadcast channel information on the downlink central working frequency, the dedicated physical broadcast channel information comprising information of a downlink dedicated working frequency; and switching to the downlink dedicated working frequency. Embodiments of the present invention also provide corresponding devices, comprising a terminal device and a base station device. By means of the technical solution in the present invention, Machine to Machine-User equipment (M2M-UE) accesses a network of hybrid networking cells normally without affecting normal operation of the Human to Human-User Equipment (H2H-UE). After accessing the network, the M2M-UE works stably, and does not switch the working frequency frequently, thereby ensuring that the working efficiency is maintained above a certain level.

Description

Method and device for terminal accessing network

The present application claims priority to Chinese Patent Application No. 201110296806.6, entitled "Method and Apparatus for Terminal Access Network", filed on September 27, 2011, the entire contents of which is incorporated herein by reference. in.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and a device for a terminal to access a network. Background technique

The Long Term Evolution (LTE) system can support multiple bandwidths between 1 · 25 ΜΗζ and 20 ΜΗζ, such as 1.4/3/5/10/15/20 ΜΗζ six standard bandwidths, and the physical layer downlink uses orthogonal frequency division. The Orthogonal Frequency Division Multiple Access (OFDMA) technology enables different users to occupy different subcarriers in the downlink. In an LTE system, each cell deploys a network with a standard bandwidth, and terminals in a small cell can support only one standard bandwidth.

The terminal used in LTE applications is Human to Human-User Equipment (H2H-UE). The H2H-UE has large bandwidth capability, and the bandwidth of uplink and downlink data signals that can be supported is relatively large. For example, it can support the 20MHz standard. bandwidth. However, in a machine to machine (M2M) communication scenario, a low-cost M2M-UE only supports small bandwidths, such as 1.4 or 3 MHz bandwidth, but cannot support large bandwidths, such as 10 MHz or more. In order to share the existing network deployment, the cell needs to support terminals with different bandwidth capabilities, such as H2H-UE and M2M-UE. The cell is called a hybrid network cell.

In the hybrid network, the compatibility of the backward version is ensured. On the basis of not affecting the normal operation of the existing H2H-UE, the M2M-UE with small bandwidth capability can normally access the cell network and perform small bandwidth signals. Receiving and sending becomes a problem. Summary of the invention

The embodiments of the present invention provide a method and a device for a terminal to access a network, so that the M2M-UE can access the network without affecting the normal operation of the existing H2H-UE.

A method for a terminal to access a network includes: The terminal accesses the network and works in the downlink central working frequency band;

Receiving dedicated physical broadcast channel information on a downlink central working frequency band, where the dedicated physical broadcast channel information includes downlink dedicated working frequency band information;

Switch to the downlink dedicated working frequency band.

A method for a terminal to access a network includes:

The base station sends dedicated physical broadcast channel information to the terminal of the access network in the central working frequency band, where the dedicated physical broadcast channel information includes downlink dedicated working frequency band information;

Transmitting information to the terminal on the downlink dedicated working frequency band.

A terminal device, comprising:

An access unit, configured to access a network, and the terminal device after accessing the network works on a downlink central working frequency segment;

a first receiving unit, configured to receive dedicated physical broadcast channel information on a downlink central working frequency band, where the dedicated physical broadcast channel information includes downlink dedicated working frequency band information;

And a switching unit, configured to switch to the downlink dedicated working frequency band.

A base station device includes:

a first sending unit, configured to send dedicated physical broadcast channel information to a terminal of the access network in a central working frequency band, where the dedicated physical broadcast channel information includes downlink dedicated working frequency band information;

And an information transmission unit, configured to transmit information to the terminal on the downlink dedicated working frequency band. The method for accessing the network by using the terminal provided by the embodiment of the present invention, the M2M-UE can access the network of the hybrid networking cell normally without affecting the normal operation of the existing H2H-UE; and, after the access , Stable work, no frequent switching of working frequency bands, to ensure that work efficiency can be maintained above a certain level. DRAWINGS

FIG. 1 is a schematic diagram of downlink resource allocation of a hybrid network cell;

2 is a schematic diagram of uplink resource allocation of a hybrid networking cell;

3 is a schematic diagram of a frame structure in an LTE system;

4 is a schematic diagram of downlink time-frequency resources; 5 is a schematic diagram of uplink time-frequency resources;

6 is a schematic diagram of a frame structure of a first subframe of each frame in a downlink central working frequency band; FIG. 8 is a frame structure of a downlink signal on a downlink dedicated working frequency band according to an embodiment of the present invention; FIG. 9a is an embodiment of the present invention; A flow chart of a method for providing a terminal access network;

9b is a flowchart of a method for a terminal to access a network according to another embodiment of the present invention; FIG. 10 is a schematic diagram of an uplink dedicated working frequency band handover;

11 is a schematic diagram of switching of a dedicated downlink operating band;

FIG. 12 is a method for a terminal to access a network according to still another embodiment of the present invention; FIG.

FIG. 12b is a schematic diagram of a method for a terminal to access a network according to still another embodiment of the present invention; FIG.

FIG. 13 is a schematic diagram of a logical structure of a terminal device according to an embodiment of the present invention; FIG.

FIG. 13b is a schematic diagram of a logical structure of a terminal device according to another embodiment of the present invention;

FIG. 14 is a schematic diagram of a logical structure of a base station device according to an embodiment of the present invention;

FIG. 14b is a schematic diagram of a logical structure of a base station device according to another embodiment of the present invention. detailed description

The embodiments of the present invention provide a method for a terminal to access a network, and corresponding devices include a terminal device and a base station device. The method is used for the M2M-UE to normally access the network of the hybrid network cell without affecting the normal operation of the H2H-UE, and receive and transmit the small bandwidth signal.

The hybrid networking cell is an LTE cell supporting both a large bandwidth capable H2H-UE and a small bandwidth capable M2M-UE. The large bandwidth is usually the system standard bandwidth of the cell, and may be generally 20 MHz. The standard bandwidth may be the bandwidth of the H2H-UE working normally; the small bandwidth may be 1.4 MHz or 3 MHz or 5 MHz or 10 MHz, etc. In the embodiment, the 1.4 MHz bandwidth is taken as an example, and the small bandwidth may be a bandwidth in which the M2M-UE operates normally. The normal H2H-UE supports a signal bandwidth of 20 MHz and can receive a signal of 20 MHz bandwidth transmitted by a base station (eNB). However, the M2M-UE can only support the signal bandwidth of 1.4 MHz, and the hybrid network cell needs to allocate a bandwidth of 1.4 MHz in the 20 MHz frequency band for use by the M2M-UE.

FIG. 1 is a schematic diagram of downlink resource allocation of the hybrid network cell. In the figure, carrier1 is a center carrier of a standard bandwidth 20 MHz band, and carrier 2 and carrier 3 are bands defined in the 20 MHz band. The center carrier of the band of 1.4 MHz wide. The H2H-UE operates in the 20 MHz band, and the M2M-UE operates on the carrier MHz or carrier3 as the center carrier's 1.4 MHz band. The allocation of the row resources on the hybrid group is similar to the downlink resource allocation described above. As shown in FIG. 2, the 1.4 MHz band with carrier2 or carrier3 as the center carrier is also divided in the 20 MHz band with carrierl as the center carrier. It should be noted that the above carrier2 or carrier3 may be a virtual carrier, that is, the carrier does not exist normally, and the center carrier still uses carrierl, and the center carrier of the device such as the filter is modulated at a distance from the carrier1 to the fixed frequency domain. , that is, the location of the virtual carrier where carrier2 or carrier3 is located.

In this paper, according to the difference of the center frequency, the downlink working frequency band of the M2M-UE is divided into two types, one is the downlink central working frequency band, which is based on the central carrier of the standard bandwidth of the LTE system, with M2M- The standard small bandwidth supported by the UE is the frequency band of the frequency band, for example, the frequency band of 1.4 MHz with the carrierl as the center frequency in FIG. 1; the other is the downlink dedicated working frequency band, which refers to the standard small bandwidth operation except the central working frequency band. The frequency band, for example, the frequency band of 1.4 MHz bandwidth with carrier2 or carrier3 as the center frequency point in FIG. The uplink working frequency band of the M2M-UE does not need to be specifically divided into the central working frequency band, which is collectively referred to as the uplink dedicated working frequency band, and the uplink dedicated working frequency band may also be the frequency band of the 1.4 MHz bandwidth centered on the central carrier of the standard bandwidth of the LTE system. The downlink center working frequency band may be a frequency band with a center bandwidth of a bandwidth in which the H2H-UE operates normally, and a small bandwidth with a normal operation of the M2M-UE as a frequency band width band. The downlink dedicated working frequency band may be a frequency band in which the M2M-UE operates normally except the downlink central working frequency band. The uplink dedicated working frequency band of the M2M-UE may be a frequency band in which the M2M-UE operates normally.

The frame structure in the LTE system is as shown in FIG. 3, and one frame includes 10 subframes, and each subframe time is lms. One subframe may be referred to as a Transmission Time Interval (TTI), and one subframe is further There are two slots, each of which includes a plurality of Orthogonal Frequency Division Multiple (OFDM) symbols, which may be, for example, 6 or 7 OFDM symbols. . In the LTE system, the smallest unit of resource scheduling is a TTI, that is, one subframe, and the time is lms. In the frequency domain, due to different system bandwidths, different numbers of subcarriers are included, for example, a 1.4 MHz bandwidth includes 72 subcarriers. One OFDM symbol in the time domain, one subcarrier in the frequency domain is called a physical resource element (PRE), and 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain are called a physical resource block (PRB). For example, the system bandwidth of 1.4 MHz has a total of 6 PRBs in the frequency domain. The downlink time-frequency resource diagram shown in FIG. 4, the first few of each subframe of the downlink signal For example, three OFDM symbols are control domain resources, and physical downlink control channel (PDCCH) information is transmitted, and the next 11 OFDM symbols are data domain resources, and a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) information. The uplink time-frequency resource diagram is shown in Figure 5. The two ends of the band, that is, the band low band and the high band are control domain resources, and transmit physical Uplink Control Channel (PUCCH) information. The middle part of the band is data domain resources. The Physical Uplink Shared Channel (PUSCH) information is transmitted.

Referring to FIG. 6, the existing frequency-division duplex (FDD) LTE is taken as an example. The first three OFDM symbols of the first subframe of each frame of the downlink signal are identified as The three OFDM symbols of 0, 1, and 2 transmit PDCCH information as part of the control domain of the H2H-UE, occupying the entire available downlink bandwidth resource in the frequency domain, for example, 20 MHz; the first time slot, that is, the last two OFDM symbols of slot 0 Used as a synchronization signal, occupying 62 subcarriers of the central frequency band in the frequency domain, that is, a 1.08 MHz bandwidth, the partial synchronization signal is used for terminal search synchronization to access the cell network; the first few of the second time slot of the subframe, for example, 4 The OFDM symbol is used as a physical broadcast channel. The embodiment of the present invention enables the M2M-UE to access the hybrid network cell network normally, without affecting the normal operation of the H2H-UE, for the downlink signal. The frame structure is improved as follows.

The improvement of the frame structure of the downlink signal on the downlink central working frequency band is as shown in FIG. 7, which includes: defining the available OFDM symbol of the first subframe of each frame as the control domain part of the M2M-UE, and defining it as dedicated physics Dedicated Physical Broadcast Channel (DPBCH), which is a broadcast channel dedicated to M2M-UE, occupies 72 subcarriers in the center frequency band in the frequency domain, that is, 1.08 MHz bandwidth. The available OFDM symbols refer to the symbols occupied by the control channel and the reference signal that are not used for the existing H2H-UE, for example, the 4th to 5th OFDM symbols of the first subframe are identified as Two OFDM symbols of 3 and 4. Since the existing H2H-UE does not parse the part of the signal, it does not affect the use of the H2H-UE. The DPBCH includes information about a downlink dedicated working frequency band of a 1.4 MHz bandwidth specifically allocated for the M2M-UE, such as a center frequency of a downlink dedicated working frequency band, such as carrier2 or carrier3 in FIG. 1, or a location of a downlink dedicated working frequency band, that is, Which PRBs are located in a large bandwidth such as the 20M band. The 6-7th OFDM signal of the reserved subframe remains unchanged, and is still used as a synchronization signal, occupying 62 subcarriers of the center frequency band in the frequency domain, that is, 1.08 MHz bandwidth, and the partial synchronization signal is used for terminal search. Synchronize to access the cell network.

The improvement of the downlink signal frame structure on the downlink dedicated working frequency band is as shown in FIG. 8, and includes: k OFDM symbols starting from the 4th OFDM symbol of each subframe, that is, the OFDM symbol identified as 3, as the M2M-UE The control domain part, k is a positive integer and k+4 is not greater than the number of OFDM symbols included in one subframe. In this paper, k=4 is taken as an example, that is, the control domain part includes 4 OFDM symbols identified as 3 to 6. .

The control domain part of the M2M-UE includes: Dedicated Physical Control Format Indicator Channel (Dedicated Physical

Control Format Indicator Channel , DPCFICH ) , dedicated HARQ physical indicator channel

(Dedicated Physical HARQ (Hybrid Automatic Repeat Request) Indicator Channel, DPHICH), and Dedicated Physical Downlink Control Channel (DPDCCH).

Wherein, the value of k is stored in the DPCFICH, indicating the length of the control domain part, and can be used to indicate which OFDM symbol the data domain part of the M2M-UE starts from, and the default downlink data field is from

3+k+l OFDM symbols start, and when k=4, the second time slot of one subframe is used as the data domain of the M2M-UE.

The DPHICH channel is a dedicated HARQ feedback channel for M2M-UE uplink data, the M2M-UE transmits uplink data on the PUSCH channel on the uplink dedicated working frequency band, the eNB receives the data and decodes, and if correctly decoded, the feedback on the DPHICH channel ACK (Acknowledgement), otherwise, feedback NACK (Not Acknowledgement), the M2M-UE obtains the DPHICH information to obtain whether the eNB correctly decodes. If the DPHICH feeds back NACK, the UE needs to retransmit the last transmission. data. The resources occupied by the DPHICH are in the resources of the dedicated control domain, and the time-frequency resource mapping is the same as the existing PHICH.

The DPDCCH is used for scheduling uplink and downlink data transmission, including scheduling a dedicated system message for the M2M-UE. System Information Block (SIB). The SIB includes various types such as SIB1, SIB2, and SIB3 depending on the information to be included. The SIB1 includes scheduling information of other SIBs, which is used to indicate scheduling periods of other SIBs, and SIB1 is normally stored in the fifth subframe by default. In this embodiment, the SIB1 is divided into two types, one is a first SIB1 dedicated to the M2M-UE, and is scheduled by the DPDCCH; the other is a second SIB1 dedicated to the H2H-UE, which is scheduled by the PDCCH.

The improvement of the frame structure is described above.

Referring to FIG. 9a, a method for a terminal to access a network according to an embodiment of the present invention is described. The method includes:

101. The terminal accesses the network and works in the downlink central working frequency band.

Generally, when the M2M-UE needs to access the network of the hybrid network cell, the cell search is performed first, and the synchronization signal on the downlink central working frequency band is searched. After the synchronization is completed, the downlink works in the downlink central working frequency band, and the base station can be received. Broadcast information sent on the downlink center operating band.

102. Receive dedicated physical broadcast channel (DPBCH) information on a downlink central working frequency band, where the dedicated physical broadcast channel information includes downlink dedicated working frequency band information. The dedicated physical broadcast channel information is information dedicated to transmission on the broadcast channel of the M2M-UE.

The DPBCH is located in the first subframe of each frame on the downlink central operating band as part of the control domain of the M2M-UE. The base station may carry the information of the downlink dedicated working frequency band of the 1.4 MHz bandwidth specifically allocated for the M2M-UE to the terminal in the DPBCH, so that the terminal switches to the downlink dedicated working frequency band. It can be understood that, after the terminal accesses the network, the base station does not need to carry the downlink dedicated working frequency band information in the DPBCH or the downlink working frequency band information that is carried in the central working frequency band, so that the terminal can continue to work in the downlink center after being accessed. In the working frequency band, the base station can carry the downlink dedicated working frequency band information in the DPBCH and send it to the end when the downlink dedicated working frequency band needs to be adjusted. End.

The downlink dedicated working frequency band information may be carried in the DPBCH in a plurality of manners. In one mode, the information of the downlink dedicated working frequency band, including the center frequency point and the frequency band bandwidth, may be directly carried in the DPBCH; An index can be established, and the correspondence between the center frequency point of the downlink or uplink dedicated working frequency band and the bandwidth of the frequency band and the index value is stored in the index, and the index is pre-stored in the M2M-UE, and only the index value can be saved in the DPBCH. . After receiving the DPBCH information, the M2M-UE obtains the index value, and then searches for the center frequency and the bandwidth of the corresponding downlink dedicated working frequency band from the saved index.

The index can be stored in the M2M-UE in the form of a table, as shown in Table 1 below:

Table 1

In the above table, Carrier 1 is the center carrier of the 20MHz standard bandwidth, and Carrier 1 moves the N resource blocks (PRBs) to the high frequency (+) or low frequency (1) to indicate the center frequency of the downlink dedicated working frequency band.

N is a positive integer.

Alternatively, the index may be represented by a bit sequence shown in Table 2. In Table 2, the bit sequence is divided into three segments, and the first segment indicates the bandwidth of the downlink dedicated working band, such as 1.4M, 3M, 5M or 10M. Etc., can be represented by two bits; the second segment represents the frequency shift direction of the center frequency of the downlink dedicated working frequency band with respect to the center carrier of the 20 MHz standard bandwidth, including the high frequency offset (+) or the low frequency offset ( a) can be represented by one bit; the third segment indicates the magnitude of the frequency shift, expressed in units of the number of resource blocks (PRBs), which can be represented by seven bits.

It should be noted that the DPBCH is located in the available OFDM symbol of one subframe in the downlink central working frequency band, and the H2H-UE does not parse the partial signal. Therefore, this step does not cause any work on the normal operation of the H2H-UE. influences.

103. Switch to the downlink dedicated working frequency band.

If the DPBCH includes the downlink dedicated working frequency band information, the M2M-UE may switch to the downlink dedicated working frequency band indicated by the downlink dedicated working frequency band according to the indication of the DPBCH, and from then on, the downlink works in the downlink dedicated working frequency band, unless The downlink dedicated working frequency band changes.

In an implementation manner, the dedicated physical broadcast channel (DPBCH) information received by the terminal in 102 may also include the information of the uplink dedicated working frequency band of the 1.4 MHz bandwidth that is specifically allocated by the M2M-UE, and after 102, the method may further include: To the uplink dedicated working frequency band. In other words, if the DPBCH includes the downlink dedicated working frequency band information and the uplink dedicated working frequency band information, the M2M-UE may switch to the downlink dedicated working frequency band indicated by the downlink dedicated working frequency band information according to the indication of the DPBCH, and switch to the downlink dedicated working frequency band. The uplink dedicated working frequency band indicated by the uplink dedicated working frequency band information, and from then on, works in the downlink and uplink dedicated working frequency bands unless the downlink or uplink dedicated working frequency band changes.

Referring to FIG. 9b, in another embodiment, 103 may further include:

104. Receive a dedicated system information block transmitted on a downlink dedicated working frequency band, where the dedicated system information block includes uplink dedicated working frequency band information. The M2M-UE downlink operation has been performed on the downlink dedicated working frequency band, and the system information block (SIB) transmitted on the downlink dedicated working frequency band can be obtained, and the SIB can carry the information of the uplink dedicated working frequency band specifically allocated for the M2M-UE. Of course, the system information block (SIB) may also include downlink dedicated working frequency band information.

The following takes the information of the uplink dedicated working frequency band in the SIB as an example for description. Specifically, the information about the uplink dedicated working frequency band may be stored in the SIB2, and the M2M-UE may first receive the first SIB1 in the fifth subframe of the downlink dedicated working frequency band, and then receive the M2M-UE dedicated according to the scheduling indication of the first SIB1. Other SIBs, including SIB2, obtain information about the uplink dedicated working frequency band from SIB2. Similar to the carrying mode of the downlink dedicated working frequency band information, the uplink dedicated working frequency band information including the central frequency point and the frequency band bandwidth may be directly carried in the SIB2, or the index stored in the M2M-UE may be established, and the uplink dedicated working frequency band is set. The correspondence between the center frequency point and the band bandwidth and the index value is stored in the index, and the index value is carried in SIB2. Generally, the information of the uplink dedicated working frequency band is carried in the SIB2, but may also be carried in the first SIB1 or SIB3 or other SIB, and a new SIB may be defined to carry the information.

It should be noted that the H2H-UE schedules the second SIB1 through the PDCCH, and the M2M-UE passes

The DPDCCH schedules the first SIB1, that is, the two terminals respectively schedule SIB1, and do not interfere with each other. Therefore, this step does not have any impact on the normal operation of the H2H-UE. 105. Switch to the uplink dedicated working frequency band.

The M2M-UE switches to the uplink dedicated working frequency band indicated by the uplink dedicated working frequency band information according to the uplink dedicated working frequency band information included in the SIB, and starts from the beginning, and works upward in the uplink dedicated working frequency band, unless the uplink dedicated working frequency band is used. A change has occurred. The above embodiment of the present invention discloses a method for a terminal to access a network. When the M2M-UE initially accesses the network of the hybrid network, the M2M-UE works in the downlink central working frequency band. If the downlink dedicated working frequency band information is obtained in the transmitted information, the downlink is switched to the downlink dedicated working frequency band, and is stably operated on the downlink dedicated working frequency band, unless downlink The dedicated working frequency band has changed. Therefore, the M2M-UE can access the network of the hybrid networking cell normally without affecting the normal operation of the existing H2H-UE; and, after the access, the stable operation does not occur. The frequent switching of the working frequency band ensures that the working efficiency can be maintained above a certain level. In other embodiments, 105 may further include:

106. The receiving, by the base station, a dedicated paging message sent by the downlink dedicated working frequency band to indicate that the dedicated system information changes.

When the information such as the frequency of the uplink or downlink dedicated working frequency band needs to be changed, the base station sends a paging message to the terminal to notify the terminal system information (SI) that the information has changed.

107. Receive a new dedicated system information block in a next modification period of receiving the dedicated paging message, and the new dedicated system information block includes the changed uplink dedicated working frequency band information and/or the downlink dedicated working frequency band information.

The base station typically broadcasts a new dedicated SIB in the next modification period in which the dedicated paging message is sent, such as SIB2, which contains the changed uplink and/or downlink dedicated operating band information, such as the changed center frequency. The M2M-UE acquires the changed uplink and/or downlink dedicated working frequency band information by receiving a new dedicated system information block in the next modification period of receiving the dedicated paging message.

108. Switch to the changed uplink dedicated working frequency band and/or downlink dedicated working frequency band.

After acquiring the changed uplink and/or downlink dedicated working frequency band information, the M2M-UE switches to the corresponding uplink dedicated working frequency band and/or downlink dedicated working frequency band. The following are described separately: 1. When the uplink dedicated working frequency band changes: The central frequency point of the above dedicated working frequency band changes as an example. It is assumed that the SIB including the uplink dedicated working frequency band information adjusted by the central frequency point, such as SIB2, occurs in In the downlink (n+4) mod 10 uplink subframe, the M2M-UE needs to be in the (n+4) mod 10 uplink subframe. The working frequency band switching is completed, and the uplink channel information is sent to the base station on the new uplink dedicated working frequency band. Among them, the mod symbol indicates the modulo operation. Suppose the value of n is 0 to 9, and the meaning of ( n+4 ) mod 10 is: If n+4 is less than 10, take n+4, if n+4 is equal to 10 or greater than 10, then take (n+4) and divide by the remainder of 10. If there is no remainder, take 0. In an implementation manner, the terminal only needs to complete the working band switching in the (n+4) mod 10 uplink subframe. In another implementation manner, in order to prevent data loss, as shown in FIG. 10, the (n+4) mod 10 uplink subframe is divided into two time segments, and the first time segment identified as G in the figure is used as a handover. Time, the second time period identified as V in the figure is used to send uplink channel information to the base station. During the first time period, the M2M-UE completes the band switching without transmitting information to ensure that no information is lost. It should be noted that the uplink channel information may not be sent to the base station in the second time period indicated as V in the figure, and whether the uplink channel information is sent depends on the needs of the specific scenario. 2. When the downlink dedicated working frequency band changes: The following takes the central frequency point of the dedicated working frequency band as an example. Assume that the SIB including the downlink dedicated working frequency band information adjusted by the central frequency point, such as SIB2, occurs in the downlink nth subframe. Then, the effective time of the new downlink dedicated working frequency band should be in the (n+1) mod 10 downlink subframe, that is, the M2M-UE needs to be in the new downlink dedicated on the (n+1) mod 10 downlink subframe. The downlink channel information is received on the working frequency band. To prevent data loss, as shown in FIG. 11, the (n+1) mod 10 uplink subframe is divided into three time segments, and the first time segment identified as G in the figure is used as the switching time, and the identifier is C in the figure. The downlink control channel information sent by the base station is received in the second time period, and the downlink data sent by the base station is received in the third time period marked as D in the figure. During the first time period, the M2M-UE completes the band switching without receiving information to ensure that no information is lost.

Further, if the center frequency of the uplink or downlink dedicated working frequency band changes, the base station also broadcasts a new SIB including the changed uplink or downlink dedicated working frequency band information, but the M2M-UE does not receive within the preset time. To the new system information block (SIB), the M2M-UE switches the working frequency band as follows:

If the M2M-UE fails to receive the new SIB at the scheduled time, it can continue at the current The information received on the downlink dedicated working frequency band indicates that there is no change in the downlink dedicated working frequency band. The M2M-UE can continue to receive the SIB of the next scheduling period, such as SIB2, or the SIB2 of the later period, in the downlink dedicated working frequency band, to obtain the information again. The changed uplink dedicated working frequency band information.

If the M2M-UE cannot receive any layer 1 or layer 2 information in the current downlink dedicated working frequency band for a period of time, indicating that the downlink dedicated working frequency band has changed, the M2M-UE may switch back to the downlink center working frequency band, and repeat the steps. 101-105, thus switching to the new downlink and uplink dedicated operating bands. Usually, layer one is the physical layer, and layer two is the RRC (Radio Resource Control) layer.

In order to ensure that the M2M-UE can obtain new dedicated working frequency band information in time, the base station needs to reflect the changed downlink dedicated working frequency band information in the DPBCH on the downlink central working frequency band. Generally, if a new SIB including the changed downlink dedicated working frequency band information, such as SIB2, occurs in the downlink nth subframe, the base station carries the changed downlink dedicated working frequency band information to the next one after the nth subframe. The DPBCH of the first downlink subframe of the frame. For example, if SIB2 occurs in the third downlink subframe whose system frame number (SFN) is 1, the new DPBCH occurs in the first downlink subframe where SFN is 2. Therefore, the M2M-UE of the changed SIB2 or the newly accessed one cannot be received in time.

Dedicated working frequency band information. In summary, the preferred embodiment describes how the M2M-UE switches its working frequency band when information such as the frequency of the uplink or downlink dedicated working frequency band changes, including: The base station broadcasts a new broadcast including the changed uplink. Or the SIB of the downlink dedicated working frequency band information, after receiving the new SIB, the M2M-UE completes the handover within the specified handover time, and the base station does not schedule the M2M-UE during the handover time, and does not perform uplink or downlink data transmission. To prevent data loss. Therefore, when the uplink or downlink dedicated working frequency band information changes, the M2M-UE can switch its working frequency band in time without causing data loss. Referring to FIG. 12a, an embodiment of the present invention further provides a method for a terminal to access a network, including: 201. A base station sends dedicated physical broadcast channel information to a terminal of an access network in a central working frequency band, where the dedicated physical broadcast channel information includes Downstream dedicated working frequency band information.

Generally, when the M2M-UE needs to access the network of the hybrid network cell, the cell search is first performed to search for the synchronization signal on the downlink central working frequency band. After the synchronization is completed, the downlink operation is performed on the downlink central working frequency band. The base station may carry the information of the downlink dedicated working frequency band allocated to the M2M-UE to be transmitted to the terminal M2M-UE in the dedicated physical broadcast channel DPBCH, so that the M2M-UE switches to the downlink dedicated working frequency band information indication according to the indication of the DPBCH. The downlink dedicated working frequency band.

202. Transmit information to the terminal on the downlink dedicated working frequency band.

After the base station carries the downlink dedicated working frequency band information in the DPBCH and sends the information to the terminal, the information can be transmitted to the terminal in the downlink dedicated working frequency band from a predetermined time, and the feedback information of the receiving terminal can also be received. After the handover is completed, information is transmitted to the terminal on the downlink dedicated working frequency band.

Further, the base station may also carry the information of the uplink dedicated working frequency band allocated to the M2M-UE to the dedicated physical broadcast channel DPBCH and send it to the terminal M2M-UE. Then, the information transmitted by the terminal may be received on the uplink dedicated working frequency band. The M2M-UE switches to the downlink dedicated working frequency band indicated by the downlink dedicated working frequency band information according to the indication of the DPBCH, and switches to the downlink dedicated working frequency band of the downlink dedicated working frequency band information, and does not change from the beginning. Unless the downlink or uplink dedicated operating band changes.

Referring to FIG. 12b, in another implementation manner, 202 may further include:

203. Send a system information block to the terminal in a downlink dedicated working frequency band, where the system information block includes uplink dedicated working frequency band information.

204. Receive information transmitted by the terminal on the uplink dedicated working frequency band.

The base station may carry the information of the uplink dedicated working frequency band allocated to the M2M-UE in the system information block (SIB) and send it to the terminal M2M-UE. Therefore, the M2M-UE switches to the uplink dedicated working frequency band indicated by the uplink dedicated working frequency band information according to the uplink dedicated working frequency band information included in the SIB, and from then on, the M2M-UE uplink works on the uplink dedicated working frequency band, unless the The uplink dedicated working frequency band has changed. Of course, the system information block may also include downlink dedicated working frequency band information.

Further, in other implementation manners, 204 may further include: 205. When a change occurs in the uplink dedicated working frequency band and/or the downlink dedicated working frequency band, a dedicated paging message for indicating that the dedicated system information changes is sent on the downlink dedicated working frequency band.

206. Send a new dedicated system information block in a next modification period in which the dedicated paging message is sent, where the new dedicated system information block includes the changed uplink dedicated working frequency band information and/or the downlink dedicated working frequency band information.

207. Receive information transmitted by the terminal on the changed uplink dedicated working frequency band, and/or transmit information to the terminal on the changed downlink dedicated working frequency band.

The information transmitted by the receiving terminal on the changed uplink dedicated working frequency band includes: if a new dedicated system information block including the changed uplink dedicated working frequency band information occurs in the downlink nth subframe, then the (n+) 4) The second time period of the mod 10 uplink subframe receives the information sent by the terminal on the changed uplink dedicated working frequency band.

Transmitting information to the terminal on the changed downlink dedicated working frequency band includes: if the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the (n+1)th The mod 10 downlink subframe transmits information to the terminal in the changed downlink dedicated working frequency band in the second time period.

Further, the method further includes: if the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the changed downlink dedicated working frequency band information is carried in the nth subframe In the dedicated physical broadcast channel of the first downlink subframe of the next frame. Therefore, the M2M-UE or the newly accessed M2M-UE that fails to receive the changed new system information block in time can obtain the changed downlink dedicated in the dedicated physical broadcast channel (DPBCH) in the downlink central working frequency band in time. Working frequency band information.

The above embodiment of the present invention discloses a method for a terminal to access a network, and the method is used.

When the M2M-UE initially accesses the network of the hybrid network, it works in the downlink central working frequency band. Once the downlink dedicated working frequency band information is obtained from the information transmitted in the downlink central working frequency band, the downlink switches to the downlink dedicated working frequency band. And stable operation in the downlink dedicated working frequency band, unless the downlink dedicated working frequency band changes. Therefore, by using the method of the embodiment, the M2M-UE can be used without affecting the existing

Based on the normal operation of the H2H-UE, the normal access to the network of the hybrid networking cell; and, in the access After that, the stable work, the frequent switching of the working frequency band will not be carried out, and the working efficiency can be maintained above a certain level. Referring to FIG. 13a, an embodiment of the present invention further provides a terminal device, including:

The access unit 301 is configured to access the network, and the terminal device after accessing the network works in a downlink central working frequency band;

The first receiving unit 302 is configured to receive dedicated physical broadcast channel information on a downlink central working frequency band, where the dedicated physical broadcast channel information includes downlink dedicated working frequency band information;

The switching unit 303 is configured to switch to the downlink dedicated working frequency band.

In an implementation manner, the dedicated physical broadcast channel information received by the first receiving unit 302 further includes uplink dedicated working frequency band information; and the switching unit 303 is further configured to switch to the uplink dedicated working frequency band.

Referring to FIG. 13b, in another implementation manner, the terminal device may further include:

The second receiving unit 304 is configured to receive a system information block transmitted on a downlink dedicated working frequency band, where the system information block includes uplink dedicated working frequency band information.

The system information block may further include downlink dedicated working frequency band information.

further,

The second receiving unit 304 may be further configured to receive, on a downlink dedicated working frequency band, a dedicated paging message sent by the base station to indicate that the dedicated system information changes, and receive the next modification period of receiving the dedicated paging message. a new dedicated system information block, the new dedicated system information block includes changed uplink dedicated working frequency band information and/or downlink dedicated working frequency band information; and the switching unit is configured to switch to the changed uplink dedicated working frequency band and / or downlink dedicated working frequency band.

Referring to FIG. 13b, the terminal device may further include: a sending unit 305. If a new system information block including the changed uplink dedicated working frequency band information occurs in the downlink nth subframe, the switching unit The 303 may complete the switching of the uplink dedicated working frequency band in the first time period of the (n+4) mod 10 uplink subframe, where the sending unit 305 may be in the second time of the (n+4) mod 10 uplink subframe. Sending information to the base station in the uplink dedicated working frequency band after the handover; if the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the switching unit 303 may be in the (n) +1) mod 10 first period of the uplink subframe The second receiving unit 304 receives the information sent by the base station in the downlink dedicated working frequency band after the handover in the second time period of the (n+1) mod 10 downlink subframe.

Further, the second receiving unit 304 can not receive any layer 1 or layer 2 information for a period of time in the current downlink dedicated working frequency band; the switching unit 303 can switch to the downlink center working frequency band.

The terminal device may be an M2M-UE, such as a set top box or the like.

The above embodiment of the present invention discloses a terminal device, which is an M2M terminal, that is, an M2M-UE. When the terminal device initially accesses the network of the hybrid network cell, it works in the downlink central working frequency band. Once the downlink dedicated working frequency band information is obtained from the information transmitted in the downlink central working frequency band, the downlink switch to the downlink dedicated working frequency band to work. And stable operation in the downlink dedicated working frequency band, unless the downlink dedicated working frequency band changes. Therefore, the M2M-UE can access the network of the hybrid networking cell normally without affecting the normal operation of the existing H2H-UE; and, after the access, the stable working, the frequent working frequency band that will not be performed Switching to ensure that work efficiency can be maintained above a certain level. Referring to FIG. 14a, an embodiment of the present invention further provides a base station device, including a machine, a power supply, an antenna, a radio frequency unit, a control unit, a baseband unit, and the like, and further includes:

The first sending unit 401 is configured to send dedicated physical broadcast channel information to the terminal accessing the network in the central working frequency band, where the dedicated physical broadcast channel information includes downlink dedicated working frequency band information.

The information transmission unit 402 is configured to transmit information to the terminal on the downlink dedicated working frequency band.

The dedicated physical broadcast channel information may further include uplink working frequency band information, so that the terminal switches to the uplink dedicated working frequency band.

Referring to FIG. 14b, in another embodiment, the base station device may further include an information receiving unit 403. The information transmission unit 402 is further configured to send a dedicated system information block to the terminal in a downlink dedicated working frequency band, where the dedicated system information is used. The block contains uplink dedicated working frequency band information;

The information receiving unit 403 is configured to receive, by using the terminal, the transmission on the uplink dedicated working frequency band. Information.

The dedicated system information block may also include downlink dedicated working frequency band information.

further,

The information transmission unit 402 may be further configured to: when the uplink dedicated working frequency band and/or the downlink dedicated working frequency band change, send a dedicated paging message for indicating that the dedicated system information changes on the downlink dedicated working frequency band, and Transmitting, by the third sending unit, a new dedicated system information block in a next modification period of sending the dedicated paging message, where the new dedicated system information block includes changed uplink dedicated working frequency band information and/or downlink dedicated work Frequency band information, and transmitting information to the terminal on the changed downlink dedicated working frequency band;

The information receiving unit 403 is configured to receive information transmitted by the terminal on the changed uplink dedicated working frequency band.

further more,

If the new dedicated system information block including the changed uplink dedicated working frequency band information occurs in the downlink nth subframe, the information receiving unit 403 may be in the (n+4) mod 10 second time period of the uplink subframe. The information transmitted by the terminal is received on the uplink dedicated working frequency band after the internal change.

If the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the information transmission unit 402 may be in the second time period of the (n+1) mod 10 downlink subframe. The changed downlink dedicated working frequency band transmits information to the terminal.

Referring to FIG. 14b, the base station device may further include:

The information processing unit 404 is configured to: after the new system information block that includes the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, carry the changed downlink dedicated working frequency band information after the nth subframe In the dedicated physical broadcast channel of the first downlink subframe of the next frame.

In the above, the embodiment of the present invention discloses a base station device, where the base station device allows the M2M-UE to initially access the hybrid network cell network of the base station device, and works on the downlink central working frequency band allocated by the base station for the M2M-UE. The M2M-UE obtains the downlink dedicated working frequency band information specifically allocated by the base station for the M2M-UE from the information transmitted in the downlink central working frequency band, and then the M2M-UE downlinks to the downlink dedicated working frequency band to work, and stably works in the downlink dedicated working work. In the frequency band, unless the downlink dedicated working frequency band changes. The base station device of the present embodiment allows the M2M-UE to access the network of the hybrid networking cell normally without affecting the normal operation of the existing H2H-UE; and, after the access, stable operation, The frequent switching of the working frequency band will not be carried out, and the working efficiency can be maintained above a certain level. A person of ordinary skill in the art may understand that all or part of the steps of the foregoing embodiments may be completed by hardware, or may be completed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. The storage medium may include: a read only memory, a read-only memory, a magnetic disk or an optical disk, and the like.

The method and device for accessing a network provided by the embodiment of the present invention are described in detail above, but the above is only a preferred embodiment of the present invention, and is only used to help understand the method and core idea of the present invention. It is to be understood that the invention is not limited by the scope of the invention, and any changes or substitutions that can be easily conceived within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request

A method for a terminal to access a network, comprising:

The terminal accesses the network and works in the downlink central working frequency band;

Switch to the downlink dedicated working frequency band.

2. The method of claim 1 wherein:

The dedicated physical broadcast channel information further includes uplink dedicated working frequency band information;

After receiving the dedicated physical broadcast channel information on the downlink central working frequency band, the method further includes: switching to the uplink dedicated working frequency band.

The method according to claim 1, wherein the switching to the downlink dedicated working frequency band further includes:

Receiving a dedicated system information block transmitted on a downlink dedicated working frequency band, where the dedicated system information block includes uplink dedicated working frequency band information;

Switch to the uplink dedicated working frequency band.

The method according to any one of claims 1 to 3, further comprising: receiving, on a downlink dedicated working frequency band, a dedicated paging message sent by the base station to indicate that the dedicated system information changes;

Receiving a new dedicated system information block in a next modification period of receiving the dedicated paging message, the new dedicated system information block including the changed uplink dedicated working frequency band information and/or downlink dedicated working frequency band information;

Switch to the changed uplink dedicated working frequency band and/or downlink dedicated working frequency band.

The method according to claim 4, wherein the switching to the changed uplink dedicated working frequency band comprises:

If the new dedicated system information block including the changed uplink dedicated working frequency band information occurs in the downlink nth subframe, the uplink dedicated working frequency band is completed in the first time period of the (n+4) mod 10 uplink subframe. Switching, in the second time period of the (n+4) mod 10 uplink subframe, transmitting information to the base station on the switched uplink dedicated working frequency band.

The method according to claim 4, wherein the switching to the changed downlink specialization The working frequency band includes:

If the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the downlink dedicated working frequency band is switched in the first time period of the (n+1) mod 10 downlink subframe. And receiving information sent by the base station in the downlink dedicated working frequency band after the handover in the second time period of the (n+1) mod 10 downlink subframe.

The method according to any one of claims 1 to 3, further comprising: if any layer one or layer two information cannot be received within a period of time in the downlink dedicated working frequency band;

Then switch to the downlink central working frequency band.

8. A method according to any one of claims 1 to 3, characterized in that:

The dedicated physical broadcast channel occupies available orthogonal frequency division multiplexed OFDM symbols for the first subframe of each frame on the downlink center operating band.

9. The method of claim 3 wherein:

Each subframe on the downlink dedicated working frequency band includes a control domain portion that occupies k OFDM symbols from the 4th OFDM symbol of each subframe, k is a positive integer and k+4 is not The number of OFDM symbols included in one subframe is greater than one subframe, and the control domain portion includes a dedicated physical downlink control channel DPDCCH, where the DPDCCH is used to schedule the dedicated system information block.

A method for a terminal to access a network, comprising:

11. The method of claim 10, wherein:

The dedicated physical broadcast channel information further includes uplink working frequency band information;

Receiving information transmitted by the terminal on the uplink dedicated working frequency band.

12. The method according to claim 10, further comprising:

Transmitting a dedicated system information block to the terminal in the downlink dedicated working frequency band, where the dedicated system information block includes uplink dedicated working frequency band information;

The method according to any one of claims 10 to 12, further comprising: When the uplink dedicated working frequency band and/or the downlink dedicated working frequency band change, a dedicated paging message for indicating that the dedicated system information changes is sent on the downlink dedicated working frequency band;

Transmitting a new dedicated system information block in a next modification period in which the dedicated paging message is sent, where the new dedicated system information block includes changed uplink dedicated working frequency band information and/or downlink dedicated working frequency band information;

Receiving information transmitted by the terminal on the changed uplink dedicated working frequency band, and/or transmitting information to the terminal on the changed downlink dedicated working frequency band.

The method according to claim 13, wherein the receiving the information transmitted by the terminal on the changed uplink dedicated working frequency band comprises:

If the new dedicated system information block including the changed uplink dedicated working frequency band information occurs in the downlink nth subframe, the changed uplink dedicated operation in the second time period of the (n+4) mod l0 uplink subframe Receiving information sent by the terminal on a frequency band.

The method according to claim 13, wherein the transmitting the information to the terminal on the changed downlink dedicated working frequency band comprises:

If the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the changed downlink dedicated working frequency band in the second time period of the (n+1) mod 10 downlink subframe Sending information to the terminal.

16. The method according to claim 13, further comprising:

If the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the changed downlink dedicated working frequency band information is carried in the first frame of the next frame after the nth subframe. The dedicated physical broadcast channel of the downlink subframes.

17. A method according to any one of claims 10 to 12, characterized in that:

18. A method according to any one of claims 10 to 12, characterized in that:

19. A terminal device, comprising:

20. The terminal device according to claim 19, wherein:

The switching unit is further configured to switch to the uplink dedicated working frequency band.

The terminal device according to claim 19, further comprising: a second receiving unit;

The second receiving unit is configured to receive a dedicated system information block transmitted on a downlink dedicated working frequency band, where the dedicated system information block includes uplink dedicated working frequency band information;

The terminal device according to claim 21, further comprising:

The second receiving unit is further configured to receive, on a downlink dedicated working frequency band, a dedicated paging message sent by the base station to indicate that the dedicated system information changes, and receive a new dedicated period in a next modification period of receiving the dedicated paging message. a system information block, where the new dedicated system information block includes changed uplink dedicated working frequency band information and/or downlink dedicated working frequency band information;

The switching unit is configured to switch to the changed uplink dedicated working frequency band and/or the downlink dedicated working frequency band.

The terminal device according to claim 22, further comprising: a sending unit; if the new system information block including the changed uplink dedicated working frequency band information occurs in the downlink nth subframe, the switching The unit completes the switching of the uplink dedicated working frequency band in the first time period of the (n+4) mod 10 uplink subframe, and the sending unit switches in the second time period of the (n+4) mod 10 uplink subframe. Sending information to the base station on the uplink dedicated working frequency band;

If the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the switching unit completes the downlink dedicated in the first time period of the (n+1) mod 10 uplink subframe. Switching of the working frequency band, the second receiving unit is in the (n+1) mod 10 downlink subframe The information transmitted by the base station is received on the downlink dedicated working frequency band after the handover in the second time period.

24. The terminal device according to claim 22, wherein:

The second receiving unit cannot receive any layer 1 or layer 2 information for a period of time in the downlink dedicated working frequency band;

Then, the switching unit switches to the downlink central working frequency band.

25. A base station device, comprising:

And an information transmission unit, configured to transmit information to the terminal on the downlink dedicated working frequency band.

The base station device according to claim 25, further comprising: an information receiving unit;

The information receiving unit is configured to receive information transmitted by the terminal on the uplink dedicated working frequency band.

The information transmission unit is configured to send a dedicated system information block to the terminal in the downlink dedicated working frequency band, where the dedicated system information block includes uplink dedicated working frequency band information;

28. The base station device according to claim 27, wherein:

The information transmission unit is further configured to: when the uplink dedicated working frequency band and/or the downlink dedicated working frequency band change, send a dedicated paging message for indicating that the dedicated system information changes on the downlink dedicated working frequency band, and at the sending station Transmitting a new dedicated system information block in a next modification period of the dedicated paging message, the new dedicated system information block including the changed uplink dedicated working frequency band information and/or downlink dedicated working frequency band information, and in the change Transmitting information to the terminal on a downlink dedicated working frequency band;

The information receiving unit is configured to receive information transmitted by the terminal on the changed uplink dedicated working frequency band.

29. The base station device according to claim 28, wherein:

If the new dedicated system information block including the changed uplink dedicated working frequency band information occurs in the downlink nth subframe, the information receiving unit changes during the second time period of the (n+4) mod 10 uplink subframe. The information sent by the terminal is received on the uplink dedicated working frequency band.

If the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, the information transmission unit changes after the second time period of the (n+1) mod 10 downlink subframe The downlink dedicated working frequency band transmits information to the terminal.

The base station device according to claim 28, further comprising:

An information processing unit, configured to: if the new system information block including the changed downlink dedicated working frequency band information occurs in the downlink nth subframe, carry the changed downlink dedicated working frequency band information after the nth subframe In the dedicated physical broadcast channel of the first downlink subframe of the next frame.